• Acanthephyra pelagica
• Acanthephyra purpurea
• Acanthodromia margarita Igaguri-kaikamuri
  
• Acanthomysis longicornis
• Acanthonyx formosa Taiwan-mogani
  
• Achaeopsis rostrata Edatsuno-ákeúsu
  
• Achaeus akanensis Akane-ákeúsu
  
• Achaeus boninensis Ogasawara-ákeúsu
  
• Achaeus brevidactylus Hiratsume-ákeúsu
  
• Achaeus brevifalcatus Seychelles-ákeúsu
  
• Achaeus curvirostris Nagakubi-ákeúsu
  
• Achaeus japonicus Orang-utang crab
  Akeúsu
  
• Achaeus lacertosus Yubiwa-ákeúsu
  
• Achaeus pugnax Tsuno-ákeúsu
  
• Achaeus robustus Bungo-ákeúsu
  
• Achaeus serenei Seren-ákeúsu
  
• Achaeus spinosus Toge-ákeúsu
  
• Achaeus superciliaris Akeúsu-modoki
  
• Achaeus trituberculatus Edo-ákeúsu
  
• Achaeus tuberculatus Awatsubu-ákeúsu
  
• Achaeus varians Tosa-ákeúsu
  
• Achaeus villosus Albatross-ákeúsu
  
• Acmaeopleura balssi Ohhima-ákaiso-gani
  
• Acmaeopleura depressa Hime-ákaiso-modoki
  
• Acmaeopleura parvula Hime-ákaiso-gani
  
• Acmaeopleura toriumii Toriumi-ákaiso-gani
  
• Actaea calculosa Gohsyu-ohgigani
  
• Actaea perspinosa Maldives-ohgigani
  
• Actaea pilosa Hongkong-ohgigani
  
• Actaea polyacantha Iraka-ohgigani
  
• Actaea pura Stimpson-ohgigani
  
• Actaea savignyii Savigny-ohgigani
  
• Actaea semblatae Samehada-ohgigani
  
• Actaeodes consobrinus Kobu-samehada-ohgigani
  
• Actaeodes hirsutissimus Arage-áwatsubu-gani
  
• Actaeodes mutatus Guinot-áwatsubu-gani
  
• Actaeodes semoni Megane-áwatsubu-gani
  
• Actaeodes tomentosus Biroudo-áwatsubu-gani
  
• Actaeomorpha erosa Samehada-gani
  
• Actinotrocha branchiata
• Actinotrocha hippocrepia
• Actinotrocha pallida
• Actinotrocha sabatieri
• Actumnus digitalis Tahiti-íbotegani
  
• Actumnus dorsipes Seashi-íbotegani
  
• Actumnus elegans Mergui-íbotegani
  
• Actumnus forficigerus Ibote-modoki
  
• Actumnus intermedius Mizo-íbotegani
  
• Actumnus marissinicus Chejudo-íbotegani
  
• Actumnus obesus Maui-íbotegani